Determination of strength and properties of natural stones as per IS code 1121
Determination of strength and properties of natural stones as per IS code 1121
🏗️ IS 1121: Testing Parts & Methods
| Part No. | Testing Property | Description (Asan Bhasha Mein) |
| Part 1 | Compressive Strength | Pathar par kitna load dala jaye ki wo toot jaye (Crushing strength). |
| Part 2 | Transverse Strength | Pathar ki bending capacity check karna (Modulus of Rupture). |
| Part 3 | Tensile Strength | Pathar ko khinchne par uski majbooti check karna (Direct Tension). |
| Part 4 | Shear Strength | Pathar ke layers ko ek dusre ke upar se phisalne se rokne ki shamta. |
📝 Key Specifications
Sample Size: Compressive strength ke liye aksar $50 \times 50 \times 50$ mm ke cubes ya cylinders use kiye jate hain.
Conditioning: Testing se pehle stones ko 72 ghante tak pani mein dubokar rakha jata hai taaki "Saturated Condition" mein strength check ho sake.
Rate of Loading: Load ko dhire-dhire badhaya jata hai (aksar $140$ kg/sq cm per minute).
Calculation:
$$\text{Compressive Strength} = \frac{\text{Maximum Load at Failure}}{\text{Area of Bearing Surface}}$$
✅ Stone Quality Standards (As per IS Codes)
Ek ache building stone ki compressive strength kam se kam 100 MPa (1000 kg/cm²) honi chahiye. Agar pathar ki strength 60 MPa se kam hai, toh use structural kaam ke liye acha nahi mana jata.
IS 1121 Latest Status
Main Year: 2013 (Is saal iska bada revision hua tha).
Latest Reaffirmed: Is code ko haal hi mein 2023 mein Reaffirmed kiya gaya hai.
IS 1121: Testing Table (4 Parts)
| Part No. | Topic | Latest Year |
| Part 1 | Compressive Strength (Crushing) | 2013 (Reaffirmed 2023) |
| Part 2 | Transverse Strength (Bending) | 2013 (Reaffirmed 2023) |
| Part 3 | Tensile Strength | 2013 (Reaffirmed 2023) |
| Part 4 | Shear Strength | 2013 (Reaffirmed 2023) |
Mukhya Specifications (Jo Students ko yaad honi chahiye):
Compressive Strength (Part 1): * Pathar ka sample cube ($50 \times 50 \times 50$ mm) ya cylinder shape mein hota hai.
Testing se pehle stones ko 72 ghante tak pani mein dubokar (saturation) rakha jata hai.
Ek acche building stone ki strength 100 MPa (1000 kg/cm²) se zyada honi chahiye.
Water Absorption (IS 1124): * Halanki strength IS 1121 se check hoti hai, lekin absorption ke liye IS 1124 use hota hai. Acche stone ke liye ye 5% se kam hona chahiye.
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